@Lanzfeld:
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did you guys ever try to find a way to make the sub use compressed air to change depth?
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No, is the short answer.
Most depth changes would be made with hydroplanes, much quieter. Compressed gas was used predominantly to come to the surface (and to freshen the air in the U-boat).
Don't forget that our hard-code fixes included a slow-sinking effect when below 100 metres, if using silent-running.
Stiebler.